lustre/osd-ldiskfs/osd_compat.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/osd/osd_compat.c
  33  *
  34  * on-disk structure for managing /O
  35  *
  36  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
  37  */
  38
  39 /* prerequisite for linux/xattr.h */
  40 #include <linux/types.h>
  41 /* prerequisite for linux/xattr.h */
  42 #include <linux/fs.h>
  43 /* XATTR_{REPLACE,CREATE} */
  44 #include <linux/xattr.h>
  45
  46 /*
  47  * struct OBD_{ALLOC,FREE}*()
  48  * OBD_FAIL_CHECK
  49  */
  50 #include <obd_support.h>
  51
  52 #include "osd_internal.h"
  53 #include "osd_oi.h"
  54
  55 static void osd_push_ctxt(const struct osd_device *dev,
  56                           struct lvfs_run_ctxt *newctxt,
  57                           struct lvfs_run_ctxt *save)
  58 {
  59         OBD_SET_CTXT_MAGIC(newctxt);
  60         newctxt->pwdmnt = dev->od_mnt;
  61         newctxt->pwd = dev->od_mnt->mnt_root;
  62         newctxt->fs = get_ds();
  63         newctxt->umask = current_umask();
  64         newctxt->dt = NULL;
  65
  66         push_ctxt(save, newctxt);
  67 }
  68
  69 /* utility to make a directory */
  70 static struct dentry *
  71 simple_mkdir(const struct lu_env *env, struct osd_device *osd,
  72              struct dentry *dir, const struct lu_fid *fid,
  73              const char *name, __u32 compat, int mode, bool *created)
  74 {
  75         struct osd_thread_info *info = osd_oti_get(env);
  76         struct lu_fid *tfid = &info->oti_fid3;
  77         struct inode *inode;
  78         struct dentry *dchild;
  79         int err = 0;
  80         ENTRY;
  81
  82         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
  83         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
  84         dchild = ll_lookup_one_len(name, dir, strlen(name));
  85         if (IS_ERR(dchild))
  86                 RETURN(dchild);
  87
  88         inode = dchild->d_inode;
  89         if (inode) {
  90                 struct lustre_mdt_attrs *lma = &info->oti_ost_attrs.loa_lma;
  91                 int old_mode = inode->i_mode;
  92
  93                 if (created)
  94                         *created = false;
  95
  96                 if (!S_ISDIR(old_mode)) {
  97                         CERROR("found %s (%lu/%u) is mode %o\n", name,
  98                                inode->i_ino, inode->i_generation, old_mode);
  99                         GOTO(out_err, err = -ENOTDIR);
 100                 }
 101
 102                 if (unlikely(osd->od_dt_dev.dd_rdonly))
 103                         RETURN(dchild);
 104
 105                 /* Fixup directory permissions if necessary */
 106                 if ((old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 107                         CDEBUG(D_CONFIG,
 108                                "fixing permissions on %s from %o to %o\n",
 109                                name, old_mode, mode);
 110                         inode->i_mode = (mode & S_IALLUGO) |
 111                                         (old_mode & ~S_IALLUGO);
 112                         mark_inode_dirty(inode);
 113                 }
 114
 115                 err = osd_get_lma(info, inode, &info->oti_obj_dentry,
 116                                   &info->oti_ost_attrs);
 117                 if (err == -ENODATA)
 118                         goto set_fid;
 119
 120                 if (err)
 121                         GOTO(out_err, err);
 122
 123                 if ((fid && !lu_fid_eq(fid, &lma->lma_self_fid)) ||
 124                     lma->lma_compat != compat)
 125                         goto set_fid;
 126
 127                 RETURN(dchild);
 128         }
 129
 130         err = vfs_mkdir(dir->d_inode, dchild, mode);
 131         if (err)
 132                 GOTO(out_err, err);
 133
 134         inode = dchild->d_inode;
 135         if (created)
 136                 *created = true;
 137
 138 set_fid:
 139         if (fid)
 140                 *tfid = *fid;
 141         else
 142                 lu_igif_build(tfid, inode->i_ino, inode->i_generation);
 143         err = osd_ea_fid_set(info, inode, tfid, compat, 0);
 144         if (err)
 145                 GOTO(out_err, err);
 146
 147         RETURN(dchild);
 148
 149 out_err:
 150         dput(dchild);
 151         return ERR_PTR(err);
 152 }
 153
 154 static int osd_last_rcvd_subdir_count(struct osd_device *osd)
 155 {
 156         struct lr_server_data lsd;
 157         struct dentry        *dlast;
 158         loff_t                off;
 159         int                   rc = 0;
 160         int                   count = OBJ_SUBDIR_COUNT;
 161
 162         ENTRY;
 163
 164         dlast = ll_lookup_one_len(LAST_RCVD, osd_sb(osd)->s_root,
 165                                   strlen(LAST_RCVD));
 166         if (IS_ERR(dlast))
 167                 return PTR_ERR(dlast);
 168         else if (dlast->d_inode == NULL)
 169                 goto out;
 170
 171         off = 0;
 172         rc = osd_ldiskfs_read(dlast->d_inode, &lsd, sizeof(lsd), &off);
 173         if (rc == sizeof(lsd)) {
 174                 CDEBUG(D_INFO, "read last_rcvd header, uuid = %s, "
 175                        "subdir count = %d\n", lsd.lsd_uuid,
 176                        lsd.lsd_subdir_count);
 177                 if (le16_to_cpu(lsd.lsd_subdir_count) > 0)
 178                         count = le16_to_cpu(lsd.lsd_subdir_count);
 179         } else if (rc != 0) {
 180                 CERROR("Can't read last_rcvd file, rc = %d\n", rc);
 181                 if (rc > 0)
 182                         rc = -EFAULT;
 183                 dput(dlast);
 184                 return rc;
 185         }
 186 out:
 187         dput(dlast);
 188         LASSERT(count > 0);
 189         return count;
 190 }
 191
 192 static int osd_mdt_init(const struct lu_env *env, struct osd_device *dev)
 193 {
 194         struct lvfs_run_ctxt    new;
 195         struct lvfs_run_ctxt    save;
 196         struct dentry           *parent;
 197         struct osd_mdobj_map    *omm;
 198         struct dentry           *d;
 199         struct osd_thread_info  *info = osd_oti_get(env);
 200         struct lu_fid           *fid = &info->oti_fid3;
 201         int                     rc = 0;
 202         ENTRY;
 203
 204         OBD_ALLOC_PTR(dev->od_mdt_map);
 205         if (dev->od_mdt_map == NULL)
 206                 RETURN(-ENOMEM);
 207
 208         omm = dev->od_mdt_map;
 209
 210         parent = osd_sb(dev)->s_root;
 211         osd_push_ctxt(dev, &new, &save);
 212
 213         lu_local_obj_fid(fid, REMOTE_PARENT_DIR_OID);
 214         d = simple_mkdir(env, dev, parent, fid, REMOTE_PARENT_DIR,
 215                          LMAC_NOT_IN_OI, 0755, NULL);
 216         if (IS_ERR(d))
 217                 GOTO(cleanup, rc = PTR_ERR(d));
 218
 219         omm->omm_remote_parent = d;
 220
 221         GOTO(cleanup, rc = 0);
 222
 223 cleanup:
 224         pop_ctxt(&save, &new);
 225         if (rc) {
 226                 if (omm->omm_remote_parent != NULL)
 227                         dput(omm->omm_remote_parent);
 228                 OBD_FREE_PTR(omm);
 229                 dev->od_mdt_map = NULL;
 230         }
 231         return rc;
 232 }
 233
 234 static void osd_mdt_fini(struct osd_device *osd)
 235 {
 236         struct osd_mdobj_map *omm = osd->od_mdt_map;
 237
 238         if (omm == NULL)
 239                 return;
 240
 241         if (omm->omm_remote_parent)
 242                 dput(omm->omm_remote_parent);
 243
 244         OBD_FREE_PTR(omm);
 245         osd->od_ost_map = NULL;
 246 }
 247
 248 int osd_add_to_remote_parent(const struct lu_env *env, struct osd_device *osd,
 249                              struct osd_object *obj, struct osd_thandle *oh)
 250 {
 251         struct osd_mdobj_map    *omm = osd->od_mdt_map;
 252         struct osd_thread_info  *oti = osd_oti_get(env);
 253         struct lustre_mdt_attrs *lma = &oti->oti_ost_attrs.loa_lma;
 254         char                    *name = oti->oti_name;
 255         struct osd_thread_info  *info = osd_oti_get(env);
 256         struct dentry           *dentry;
 257         struct dentry           *parent;
 258         int                     rc;
 259
 260         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_AGENTENT))
 261                 RETURN(0);
 262
 263         /* Set REMOTE_PARENT in lma, so other process like unlink or lfsck
 264          * can identify this object quickly */
 265         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry,
 266                          &oti->oti_ost_attrs);
 267         if (rc)
 268                 RETURN(rc);
 269
 270         lma->lma_incompat |= LMAI_REMOTE_PARENT;
 271         lustre_lma_swab(lma);
 272         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 273                              sizeof(*lma), XATTR_REPLACE);
 274         if (rc)
 275                 RETURN(rc);
 276
 277         parent = omm->omm_remote_parent;
 278         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 279         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 280                                            name, strlen(name));
 281         inode_lock(parent->d_inode);
 282         rc = osd_ldiskfs_add_entry(info, osd, oh->ot_handle, dentry,
 283                                    obj->oo_inode, NULL);
 284         if (!rc && S_ISDIR(obj->oo_inode->i_mode))
 285                 ldiskfs_inc_count(oh->ot_handle, parent->d_inode);
 286         else if (unlikely(rc == -EEXIST))
 287                 rc = 0;
 288         if (!rc)
 289                 lu_object_set_agent_entry(&obj->oo_dt.do_lu);
 290         CDEBUG(D_INODE, "%s: create agent entry for %s: rc = %d\n",
 291                osd_name(osd), name, rc);
 292         mark_inode_dirty(parent->d_inode);
 293         inode_unlock(parent->d_inode);
 294         RETURN(rc);
 295 }
 296
 297 int osd_delete_from_remote_parent(const struct lu_env *env,
 298                                   struct osd_device *osd,
 299                                   struct osd_object *obj,
 300                                   struct osd_thandle *oh, bool destroy)
 301 {
 302         struct osd_mdobj_map       *omm = osd->od_mdt_map;
 303         struct osd_thread_info     *oti = osd_oti_get(env);
 304         struct lustre_mdt_attrs    *lma = &oti->oti_ost_attrs.loa_lma;
 305         char                       *name = oti->oti_name;
 306         struct dentry              *dentry;
 307         struct dentry              *parent;
 308         struct ldiskfs_dir_entry_2 *de;
 309         struct buffer_head         *bh;
 310         int                        rc;
 311
 312         parent = omm->omm_remote_parent;
 313         sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
 314         dentry = osd_child_dentry_by_inode(env, parent->d_inode,
 315                                            name, strlen(name));
 316         inode_lock(parent->d_inode);
 317         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 318                                     NULL, NULL);
 319         if (IS_ERR(bh)) {
 320                 inode_unlock(parent->d_inode);
 321                 rc = PTR_ERR(bh);
 322                 if (unlikely(rc == -ENOENT))
 323                         rc = 0;
 324         } else {
 325                 rc = ldiskfs_delete_entry(oh->ot_handle, parent->d_inode,
 326                                           de, bh);
 327                 if (!rc && S_ISDIR(obj->oo_inode->i_mode))
 328                         ldiskfs_dec_count(oh->ot_handle, parent->d_inode);
 329                 mark_inode_dirty(parent->d_inode);
 330                 inode_unlock(parent->d_inode);
 331                 brelse(bh);
 332                 CDEBUG(D_INODE, "%s: remove agent entry for %s: rc = %d\n",
 333                        osd_name(osd), name, rc);
 334         }
 335
 336         if (destroy || rc) {
 337                 if (!rc)
 338                         lu_object_clear_agent_entry(&obj->oo_dt.do_lu);
 339
 340                 RETURN(rc);
 341         }
 342
 343         rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry,
 344                          &oti->oti_ost_attrs);
 345         if (rc)
 346                 RETURN(rc);
 347
 348         /* Get rid of REMOTE_PARENT flag from incompat */
 349         lma->lma_incompat &= ~LMAI_REMOTE_PARENT;
 350         lustre_lma_swab(lma);
 351         rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
 352                              sizeof(*lma), XATTR_REPLACE);
 353         if (!rc)
 354                 lu_object_clear_agent_entry(&obj->oo_dt.do_lu);
 355         RETURN(rc);
 356 }
 357
 358 int osd_lookup_in_remote_parent(struct osd_thread_info *oti,
 359                                 struct osd_device *osd,
 360                                 const struct lu_fid *fid,
 361                                 struct osd_inode_id *id)
 362 {
 363         struct osd_mdobj_map        *omm = osd->od_mdt_map;
 364         char                        *name = oti->oti_name;
 365         struct dentry               *parent;
 366         struct dentry               *dentry;
 367         struct ldiskfs_dir_entry_2 *de;
 368         struct buffer_head         *bh;
 369         int                         rc;
 370         ENTRY;
 371
 372         if (unlikely(osd->od_is_ost))
 373                 RETURN(-ENOENT);
 374
 375         parent = omm->omm_remote_parent;
 376         sprintf(name, DFID_NOBRACE, PFID(fid));
 377         dentry = osd_child_dentry_by_inode(oti->oti_env, parent->d_inode,
 378                                            name, strlen(name));
 379         inode_lock(parent->d_inode);
 380         bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
 381                                     NULL, NULL);
 382         if (IS_ERR(bh)) {
 383                 rc = PTR_ERR(bh);
 384         } else {
 385                 struct inode *inode;
 386
 387                 osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 388                 brelse(bh);
 389                 inode = osd_iget(oti, osd, id);
 390                 if (IS_ERR(inode)) {
 391                         rc = PTR_ERR(inode);
 392                         if (rc == -ESTALE)
 393                                 rc = -ENOENT;
 394                 } else {
 395                         iput(inode);
 396                         rc = 0;
 397                 }
 398         }
 399         inode_unlock(parent->d_inode);
 400         if (rc == 0)
 401                 osd_add_oi_cache(oti, osd, id, fid);
 402         RETURN(rc);
 403 }
 404
 405 /*
 406  * directory structure on legacy OST:
 407  *
 408  * O/<seq>/d0-31/<objid>
 409  * O/<seq>/LAST_ID
 410  * last_rcvd
 411  * LAST_GROUP
 412  * CONFIGS
 413  *
 414  */
 415 static int osd_ost_init(const struct lu_env *env, struct osd_device *dev)
 416 {
 417         struct lvfs_run_ctxt new;
 418         struct lvfs_run_ctxt save;
 419         struct dentry *d;
 420         int rc;
 421         bool created = false;
 422         ENTRY;
 423
 424         OBD_ALLOC_PTR(dev->od_ost_map);
 425         if (dev->od_ost_map == NULL)
 426                 RETURN(-ENOMEM);
 427
 428         /* to get subdir count from last_rcvd */
 429         rc = osd_last_rcvd_subdir_count(dev);
 430         if (rc < 0)
 431                 GOTO(cleanup_alloc, rc);
 432
 433         dev->od_ost_map->om_subdir_count = rc;
 434         INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
 435         rwlock_init(&dev->od_ost_map->om_seq_list_lock);
 436         mutex_init(&dev->od_ost_map->om_dir_init_mutex);
 437
 438         osd_push_ctxt(dev, &new, &save);
 439         d = simple_mkdir(env, dev, osd_sb(dev)->s_root, NULL, "O",
 440                          LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0755, &created);
 441         if (IS_ERR(d))
 442                 GOTO(cleanup_ctxt, rc = PTR_ERR(d));
 443
 444         if (created)
 445                 /* It is quite probably that the device is new formatted. */
 446                 dev->od_maybe_new = 1;
 447
 448         dev->od_ost_map->om_root = d;
 449
 450         pop_ctxt(&save, &new);
 451         RETURN(0);
 452
 453 cleanup_ctxt:
 454         pop_ctxt(&save, &new);
 455 cleanup_alloc:
 456         OBD_FREE_PTR(dev->od_ost_map);
 457         return rc;
 458 }
 459
 460 static void osd_seq_free(struct osd_obj_seq *osd_seq)
 461 {
 462         int j;
 463
 464         if (osd_seq->oos_dirs) {
 465                 for (j = 0; j < osd_seq->oos_subdir_count; j++) {
 466                         if (osd_seq->oos_dirs[j])
 467                                 dput(osd_seq->oos_dirs[j]);
 468                 }
 469                 OBD_FREE(osd_seq->oos_dirs,
 470                          sizeof(struct dentry *) * osd_seq->oos_subdir_count);
 471         }
 472
 473         if (osd_seq->oos_root)
 474                 dput(osd_seq->oos_root);
 475
 476         OBD_FREE_PTR(osd_seq);
 477 }
 478
 479 static void osd_ost_fini(struct osd_device *osd)
 480 {
 481         struct osd_obj_seq    *osd_seq;
 482         struct osd_obj_seq    *tmp;
 483         struct osd_obj_map    *map = osd->od_ost_map;
 484         ENTRY;
 485
 486         if (map == NULL)
 487                 return;
 488
 489         write_lock(&map->om_seq_list_lock);
 490         list_for_each_entry_safe(osd_seq, tmp, &map->om_seq_list,
 491                                  oos_seq_list) {
 492                 list_del_init(&osd_seq->oos_seq_list);
 493                 write_unlock(&map->om_seq_list_lock);
 494                 osd_seq_free(osd_seq);
 495                 write_lock(&map->om_seq_list_lock);
 496         }
 497         write_unlock(&map->om_seq_list_lock);
 498         if (map->om_root)
 499                 dput(map->om_root);
 500         OBD_FREE_PTR(map);
 501         osd->od_ost_map = NULL;
 502         EXIT;
 503 }
 504
 505 static int osd_index_backup_dir_init(const struct lu_env *env,
 506                                      struct osd_device *dev)
 507 {
 508         struct lu_fid *fid = &osd_oti_get(env)->oti_fid;
 509         struct lvfs_run_ctxt new;
 510         struct lvfs_run_ctxt save;
 511         struct dentry *dentry;
 512         int rc = 0;
 513         ENTRY;
 514
 515         lu_local_obj_fid(fid, INDEX_BACKUP_OID);
 516         osd_push_ctxt(dev, &new, &save);
 517         dentry = simple_mkdir(env, dev, osd_sb(dev)->s_root, fid,
 518                               INDEX_BACKUP_DIR, LMAC_NOT_IN_OI, 0755, NULL);
 519         if (IS_ERR(dentry)) {
 520                 rc = PTR_ERR(dentry);
 521         } else {
 522                 dev->od_index_backup_inode = igrab(dentry->d_inode);
 523                 dput(dentry);
 524         }
 525         pop_ctxt(&save, &new);
 526
 527         RETURN(rc);
 528 }
 529
 530 static void osd_index_backup_dir_fini(struct osd_device *dev)
 531 {
 532         if (dev->od_index_backup_inode) {
 533                 iput(dev->od_index_backup_inode);
 534                 dev->od_index_backup_inode = NULL;
 535         }
 536 }
 537
 538 int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
 539 {
 540         int rc;
 541         bool mdt_init = false;
 542         ENTRY;
 543
 544         rc = osd_ost_init(env, dev);
 545         if (rc)
 546                 RETURN(rc);
 547
 548         if (!dev->od_is_ost) {
 549                 rc = osd_mdt_init(env, dev);
 550                 if (rc) {
 551                         osd_ost_fini(dev);
 552                         RETURN(rc);
 553                 }
 554
 555                 mdt_init = true;
 556         }
 557
 558         rc = osd_index_backup_dir_init(env, dev);
 559         if (rc) {
 560                 osd_ost_fini(dev);
 561                 if (mdt_init)
 562                         osd_mdt_fini(dev);
 563         }
 564
 565         RETURN(rc);
 566 }
 567
 568 static struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, u64 seq)
 569 {
 570         struct osd_obj_seq *osd_seq;
 571
 572         list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
 573                 if (osd_seq->oos_seq == seq)
 574                         return osd_seq;
 575         }
 576         return NULL;
 577 }
 578
 579 static struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, u64 seq)
 580 {
 581         struct osd_obj_seq *osd_seq;
 582
 583         read_lock(&map->om_seq_list_lock);
 584         osd_seq = osd_seq_find_locked(map, seq);
 585         read_unlock(&map->om_seq_list_lock);
 586         return osd_seq;
 587 }
 588
 589 void osd_obj_map_fini(struct osd_device *dev)
 590 {
 591         osd_index_backup_dir_fini(dev);
 592         osd_ost_fini(dev);
 593         osd_mdt_fini(dev);
 594 }
 595
 596 /**
 597  * Update the specified OI mapping.
 598  *
 599  * \retval   1, changed nothing
 600  * \retval   0, changed successfully
 601  * \retval -ve, on error
 602  */
 603 static int osd_obj_update_entry(struct osd_thread_info *info,
 604                                 struct osd_device *osd,
 605                                 struct dentry *dir, const char *name,
 606                                 const struct lu_fid *fid,
 607                                 const struct osd_inode_id *id,
 608                                 handle_t *th)
 609 {
 610         struct inode               *parent = dir->d_inode;
 611         struct dentry              *child;
 612         struct ldiskfs_dir_entry_2 *de;
 613         struct buffer_head         *bh;
 614         struct inode               *inode;
 615         struct dentry              *dentry = &info->oti_obj_dentry;
 616         struct osd_inode_id        *oi_id  = &info->oti_id3;
 617         struct lustre_mdt_attrs    *lma    = &info->oti_ost_attrs.loa_lma;
 618         struct lu_fid              *oi_fid = &lma->lma_self_fid;
 619         int                         rc;
 620         ENTRY;
 621
 622         LASSERT(th != NULL);
 623         LASSERT(th->h_transaction != NULL);
 624
 625         child = &info->oti_child_dentry;
 626         child->d_parent = dir;
 627         child->d_name.hash = 0;
 628         child->d_name.name = name;
 629         child->d_name.len = strlen(name);
 630
 631         ll_vfs_dq_init(parent);
 632         inode_lock(parent);
 633         bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
 634         if (IS_ERR(bh))
 635                 GOTO(out, rc = PTR_ERR(bh));
 636
 637         if (le32_to_cpu(de->inode) == id->oii_ino)
 638                 GOTO(out, rc = 1);
 639
 640         osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
 641         inode = osd_iget(info, osd, oi_id);
 642         if (IS_ERR(inode)) {
 643                 rc = PTR_ERR(inode);
 644                 if (rc == -ENOENT || rc == -ESTALE)
 645                         goto update;
 646                 GOTO(out, rc);
 647         }
 648
 649         /* The EA inode should NOT be in OI, old OI scrub may added
 650          * such OI mapping by wrong, replace it. */
 651         if (unlikely(osd_is_ea_inode(inode))) {
 652                 iput(inode);
 653                 goto update;
 654         }
 655
 656         rc = osd_get_lma(info, inode, dentry, &info->oti_ost_attrs);
 657         if (rc == -ENODATA) {
 658                 rc = osd_get_idif(info, inode, dentry, oi_fid);
 659                 if (rc > 0 || rc == -ENODATA) {
 660                         oi_fid = NULL;
 661                         rc = 0;
 662                 }
 663         }
 664         iput(inode);
 665
 666         if (rc != 0)
 667                 GOTO(out, rc);
 668
 669         /* If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
 670          * either a crashed object or a uninitialized one. Replace it. */
 671         if (oi_fid != NULL && lu_fid_eq(fid, oi_fid)) {
 672                 CERROR("%s: the FID "DFID" is used by two objects: "
 673                        "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
 674                        oi_id->oii_ino, oi_id->oii_gen,
 675                        id->oii_ino, id->oii_gen);
 676                 GOTO(out, rc = -EEXIST);
 677         }
 678
 679         if (fid_is_idif(fid) && oi_fid != NULL && fid_is_idif(oi_fid)) {
 680                 __u32 idx1 = fid_idif_ost_idx(fid);
 681                 __u32 idx2 = fid_idif_ost_idx(oi_fid);
 682                 struct ost_id *ostid = &info->oti_ostid;
 683                 struct lu_fid *tfid = &info->oti_fid3;
 684
 685                 LASSERTF(idx1 == 0 || idx1 == osd->od_index,
 686                          "invalid given FID "DFID", not match the "
 687                          "device index %u\n", PFID(fid), osd->od_index);
 688
 689                 if (idx1 != idx2) {
 690                         if (idx1 == 0 && idx2 == osd->od_index) {
 691                                 fid_to_ostid(fid, ostid);
 692                                 ostid_to_fid(tfid, ostid, idx2);
 693                                 if (lu_fid_eq(tfid, oi_fid)) {
 694                                         CERROR("%s: the FID "DFID" is used by "
 695                                                "two objects(2): %u/%u %u/%u\n",
 696                                                osd_name(osd), PFID(fid),
 697                                                oi_id->oii_ino, oi_id->oii_gen,
 698                                                id->oii_ino, id->oii_gen);
 699
 700                                         GOTO(out, rc = -EEXIST);
 701                                 }
 702                         } else if (idx2 == 0 && idx1 == osd->od_index) {
 703                                 fid_to_ostid(oi_fid, ostid);
 704                                 ostid_to_fid(tfid, ostid, idx1);
 705                                 if (lu_fid_eq(tfid, fid)) {
 706                                         CERROR("%s: the FID "DFID" is used by "
 707                                                "two objects(2): %u/%u %u/%u\n",
 708                                                osd_name(osd), PFID(fid),
 709                                                oi_id->oii_ino, oi_id->oii_gen,
 710                                                id->oii_ino, id->oii_gen);
 711
 712                                         GOTO(out, rc = -EEXIST);
 713                                 }
 714                         }
 715                 }
 716         }
 717
 718 update:
 719         /* There may be temporary inconsistency: On one hand, the new
 720          * object may be referenced by multiple entries, which is out
 721          * of our control unless we traverse the whole /O completely,
 722          * which is non-flat order and inefficient, should be avoided;
 723          * On the other hand, the old object may become orphan if it
 724          * is still valid. Since it was referenced by an invalid entry,
 725          * making it as invisible temporary may be not worse. OI scrub
 726          * will process it later. */
 727         rc = ldiskfs_journal_get_write_access(th, bh);
 728         if (rc != 0)
 729                 GOTO(out, rc);
 730
 731         de->inode = cpu_to_le32(id->oii_ino);
 732         rc = ldiskfs_handle_dirty_metadata(th, NULL, bh);
 733
 734         GOTO(out, rc);
 735
 736 out:
 737         if (!IS_ERR(bh))
 738                 brelse(bh);
 739         inode_unlock(parent);
 740         return rc;
 741 }
 742
 743 static int osd_obj_del_entry(struct osd_thread_info *info,
 744                              struct osd_device *osd,
 745                              struct dentry *dird, char *name,
 746                              handle_t *th)
 747 {
 748         struct ldiskfs_dir_entry_2 *de;
 749         struct buffer_head         *bh;
 750         struct dentry              *child;
 751         struct inode               *dir = dird->d_inode;
 752         int                         rc;
 753         ENTRY;
 754
 755         LASSERT(th != NULL);
 756         LASSERT(th->h_transaction != NULL);
 757
 758
 759         child = &info->oti_child_dentry;
 760         child->d_name.hash = 0;
 761         child->d_name.name = name;
 762         child->d_name.len = strlen(name);
 763         child->d_parent = dird;
 764         child->d_inode = NULL;
 765
 766         ll_vfs_dq_init(dir);
 767         inode_lock(dir);
 768         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
 769         if (IS_ERR(bh)) {
 770                 rc = PTR_ERR(bh);
 771         } else {
 772                 rc = ldiskfs_delete_entry(th, dir, de, bh);
 773                 brelse(bh);
 774         }
 775         inode_unlock(dir);
 776
 777         RETURN(rc);
 778 }
 779
 780 static int osd_obj_add_entry(struct osd_thread_info *info,
 781                              struct osd_device *osd,
 782                              struct dentry *dir, char *name,
 783                              const struct osd_inode_id *id,
 784                              handle_t *th)
 785 {
 786         struct dentry *child;
 787         struct inode *inode;
 788         int rc;
 789
 790         ENTRY;
 791
 792         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
 793                 RETURN(0);
 794
 795         LASSERT(th != NULL);
 796         LASSERT(th->h_transaction != NULL);
 797
 798         inode = info->oti_inode;
 799         if (unlikely(inode == NULL)) {
 800                 struct ldiskfs_inode_info *lii;
 801                 OBD_ALLOC_PTR(lii);
 802                 if (lii == NULL)
 803                         RETURN(-ENOMEM);
 804                 inode = info->oti_inode = &lii->vfs_inode;
 805         }
 806
 807         inode->i_sb = osd_sb(osd);
 808         osd_id_to_inode(inode, id);
 809         inode->i_mode = S_IFREG; /* for type in ldiskfs dir entry */
 810
 811         child = &info->oti_child_dentry;
 812         child->d_name.hash = 0;
 813         child->d_name.name = name;
 814         child->d_name.len = strlen(name);
 815         child->d_parent = dir;
 816         child->d_inode = inode;
 817
 818         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_INVALID_ENTRY))
 819                 inode->i_ino++;
 820
 821         ll_vfs_dq_init(dir->d_inode);
 822         inode_lock(dir->d_inode);
 823         rc = osd_ldiskfs_add_entry(info, osd, th, child, inode, NULL);
 824         inode_unlock(dir->d_inode);
 825
 826         RETURN(rc);
 827 }
 828
 829 /**
 830  * Use %llu for legacy OST sequences, but use %llx for new
 831  * sequences names, so that the O/{seq}/dN/{oid} more closely
 832  * follows the DFID/PFID format. This makes it easier to map from
 833  * debug messages to objects in the future, and the legacy space
 834  * of FID_SEQ_OST_MDT0 will be unused in the future.
 835  **/
 836 static inline void osd_seq_name(char *seq_name, size_t name_size, u64 seq)
 837 {
 838         snprintf(seq_name, name_size,
 839                  (fid_seq_is_rsvd(seq) ||
 840                   fid_seq_is_mdt0(seq)) ? "%llu" : "%llx",
 841                  fid_seq_is_idif(seq) ? 0 : seq);
 842 }
 843
 844 static inline void osd_oid_name(char *name, size_t name_size,
 845                                 const struct lu_fid *fid, u64 id)
 846 {
 847         snprintf(name, name_size,
 848                  (fid_seq_is_rsvd(fid_seq(fid)) ||
 849                   fid_seq_is_mdt0(fid_seq(fid)) ||
 850                   fid_seq_is_idif(fid_seq(fid))) ? "%llu" : "%llx", id);
 851 }
 852
 853 /* external locking is required */
 854 static int osd_seq_load_locked(struct osd_thread_info *info,
 855                                struct osd_device *osd,
 856                                struct osd_obj_seq *osd_seq)
 857 {
 858         struct osd_obj_map  *map = osd->od_ost_map;
 859         struct dentry       *seq_dir;
 860         int                 rc = 0;
 861         int                 i;
 862         char                dir_name[32];
 863         ENTRY;
 864
 865         if (osd_seq->oos_root != NULL)
 866                 RETURN(0);
 867
 868         LASSERT(map);
 869         LASSERT(map->om_root);
 870
 871         osd_seq_name(dir_name, sizeof(dir_name), osd_seq->oos_seq);
 872
 873         seq_dir = simple_mkdir(info->oti_env, osd, map->om_root, NULL, dir_name,
 874                                LMAC_NOT_IN_OI | LMAC_FID_ON_OST, 0755, NULL);
 875         if (IS_ERR(seq_dir))
 876                 GOTO(out_err, rc = PTR_ERR(seq_dir));
 877         else if (seq_dir->d_inode == NULL)
 878                 GOTO(out_put, rc = -EFAULT);
 879
 880         osd_seq->oos_root = seq_dir;
 881
 882         LASSERT(osd_seq->oos_dirs == NULL);
 883         OBD_ALLOC(osd_seq->oos_dirs,
 884                   sizeof(seq_dir) * osd_seq->oos_subdir_count);
 885         if (osd_seq->oos_dirs == NULL)
 886                 GOTO(out_put, rc = -ENOMEM);
 887
 888         for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 889                 struct dentry   *dir;
 890
 891                 snprintf(dir_name, sizeof(dir_name), "d%u", i);
 892                 dir = simple_mkdir(info->oti_env, osd, osd_seq->oos_root, NULL,
 893                                    dir_name, LMAC_NOT_IN_OI | LMAC_FID_ON_OST,
 894                                    0700, NULL);
 895                 if (IS_ERR(dir)) {
 896                         GOTO(out_free, rc = PTR_ERR(dir));
 897                 } else if (dir->d_inode == NULL) {
 898                         dput(dir);
 899                         GOTO(out_free, rc = -EFAULT);
 900                 }
 901
 902                 osd_seq->oos_dirs[i] = dir;
 903         }
 904
 905         if (rc != 0) {
 906 out_free:
 907                 for (i = 0; i < osd_seq->oos_subdir_count; i++) {
 908                         if (osd_seq->oos_dirs[i] != NULL)
 909                                 dput(osd_seq->oos_dirs[i]);
 910                 }
 911                 OBD_FREE(osd_seq->oos_dirs,
 912                          sizeof(seq_dir) * osd_seq->oos_subdir_count);
 913 out_put:
 914                 dput(seq_dir);
 915                 osd_seq->oos_root = NULL;
 916         }
 917 out_err:
 918         RETURN(rc);
 919 }
 920
 921 static struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
 922                                         struct osd_device *osd, u64 seq)
 923 {
 924         struct osd_obj_map      *map;
 925         struct osd_obj_seq      *osd_seq;
 926         int                     rc = 0;
 927         ENTRY;
 928
 929         map = osd->od_ost_map;
 930         LASSERT(map);
 931         LASSERT(map->om_root);
 932
 933         osd_seq = osd_seq_find(map, seq);
 934         if (likely(osd_seq != NULL))
 935                 RETURN(osd_seq);
 936
 937         /* Serializing init process */
 938         mutex_lock(&map->om_dir_init_mutex);
 939
 940         /* Check whether the seq has been added */
 941         read_lock(&map->om_seq_list_lock);
 942         osd_seq = osd_seq_find_locked(map, seq);
 943         if (osd_seq != NULL) {
 944                 read_unlock(&map->om_seq_list_lock);
 945                 GOTO(cleanup, rc = 0);
 946         }
 947         read_unlock(&map->om_seq_list_lock);
 948
 949         OBD_ALLOC_PTR(osd_seq);
 950         if (osd_seq == NULL)
 951                 GOTO(cleanup, rc = -ENOMEM);
 952
 953         INIT_LIST_HEAD(&osd_seq->oos_seq_list);
 954         osd_seq->oos_seq = seq;
 955         /* Init subdir count to be 32, but each seq can have
 956          * different subdir count */
 957         osd_seq->oos_subdir_count = map->om_subdir_count;
 958         rc = osd_seq_load_locked(info, osd, osd_seq);
 959         if (rc != 0)
 960                 GOTO(cleanup, rc);
 961
 962         write_lock(&map->om_seq_list_lock);
 963         list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
 964         write_unlock(&map->om_seq_list_lock);
 965
 966 cleanup:
 967         mutex_unlock(&map->om_dir_init_mutex);
 968         if (rc != 0) {
 969                 if (osd_seq != NULL)
 970                         OBD_FREE_PTR(osd_seq);
 971                 RETURN(ERR_PTR(rc));
 972         }
 973
 974         RETURN(osd_seq);
 975 }
 976
 977 int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
 978                        const struct lu_fid *fid, struct osd_inode_id *id)
 979 {
 980         struct osd_obj_map              *map;
 981         struct osd_obj_seq              *osd_seq;
 982         struct dentry                   *d_seq;
 983         struct dentry                   *child;
 984         struct ost_id                   *ostid = &info->oti_ostid;
 985         int                             dirn;
 986         char                            name[32];
 987         struct ldiskfs_dir_entry_2      *de;
 988         struct buffer_head              *bh;
 989         struct inode                    *dir;
 990         struct inode                    *inode;
 991         ENTRY;
 992
 993         /* on the very first lookup we find and open directories */
 994
 995         map = dev->od_ost_map;
 996         LASSERT(map);
 997         LASSERT(map->om_root);
 998
 999         fid_to_ostid(fid, ostid);
1000         osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
1001         if (IS_ERR(osd_seq))
1002                 RETURN(PTR_ERR(osd_seq));
1003
1004         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1005         d_seq = osd_seq->oos_dirs[dirn];
1006         LASSERT(d_seq);
1007
1008         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1009
1010         child = &info->oti_child_dentry;
1011         child->d_parent = d_seq;
1012         child->d_name.hash = 0;
1013         child->d_name.name = name;
1014         /* XXX: we can use rc from sprintf() instead of strlen() */
1015         child->d_name.len = strlen(name);
1016
1017         dir = d_seq->d_inode;
1018         inode_lock(dir);
1019         bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
1020         inode_unlock(dir);
1021
1022         if (IS_ERR(bh))
1023                 RETURN(PTR_ERR(bh));
1024
1025         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
1026         brelse(bh);
1027
1028         inode = osd_iget(info, dev, id);
1029         if (IS_ERR(inode)) {
1030                 int rc = PTR_ERR(inode);
1031
1032                 RETURN(rc == -ENOENT ? -ESTALE : rc);
1033         }
1034
1035         iput(inode);
1036         RETURN(0);
1037 }
1038
1039 int osd_obj_map_insert(struct osd_thread_info *info,
1040                        struct osd_device *osd,
1041                        const struct lu_fid *fid,
1042                        const struct osd_inode_id *id,
1043                        handle_t *th)
1044 {
1045         struct osd_obj_map      *map;
1046         struct osd_obj_seq      *osd_seq;
1047         struct dentry           *d;
1048         struct ost_id           *ostid = &info->oti_ostid;
1049         u64                      oid;
1050         int                     dirn, rc = 0;
1051         char                    name[32];
1052         ENTRY;
1053
1054         map = osd->od_ost_map;
1055         LASSERT(map);
1056
1057         /* map fid to seq:objid */
1058         fid_to_ostid(fid, ostid);
1059
1060         oid = ostid_id(ostid);
1061         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1062         if (IS_ERR(osd_seq))
1063                 RETURN(PTR_ERR(osd_seq));
1064
1065         dirn = oid & (osd_seq->oos_subdir_count - 1);
1066         d = osd_seq->oos_dirs[dirn];
1067         LASSERT(d);
1068
1069         osd_oid_name(name, sizeof(name), fid, oid);
1070
1071 again:
1072         rc = osd_obj_add_entry(info, osd, d, name, id, th);
1073         if (rc == -EEXIST) {
1074                 rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1075                 if (unlikely(rc == -ENOENT))
1076                         goto again;
1077
1078                 if (unlikely(rc == 1))
1079                         RETURN(0);
1080         }
1081
1082         RETURN(rc);
1083 }
1084
1085 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
1086                        const struct lu_fid *fid, handle_t *th)
1087 {
1088         struct osd_obj_map      *map;
1089         struct osd_obj_seq      *osd_seq;
1090         struct dentry           *d;
1091         struct ost_id           *ostid = &info->oti_ostid;
1092         int                     dirn, rc = 0;
1093         char                    name[32];
1094         ENTRY;
1095
1096         map = osd->od_ost_map;
1097         LASSERT(map);
1098
1099         /* map fid to seq:objid */
1100         fid_to_ostid(fid, ostid);
1101
1102         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1103         if (IS_ERR(osd_seq))
1104                 GOTO(cleanup, rc = PTR_ERR(osd_seq));
1105
1106         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1107         d = osd_seq->oos_dirs[dirn];
1108         LASSERT(d);
1109
1110         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1111         rc = osd_obj_del_entry(info, osd, d, name, th);
1112 cleanup:
1113         RETURN(rc);
1114 }
1115
1116 int osd_obj_map_update(struct osd_thread_info *info,
1117                        struct osd_device *osd,
1118                        const struct lu_fid *fid,
1119                        const struct osd_inode_id *id,
1120                        handle_t *th)
1121 {
1122         struct osd_obj_seq      *osd_seq;
1123         struct dentry           *d;
1124         struct ost_id           *ostid = &info->oti_ostid;
1125         int                     dirn, rc = 0;
1126         char                    name[32];
1127         ENTRY;
1128
1129         fid_to_ostid(fid, ostid);
1130         osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1131         if (IS_ERR(osd_seq))
1132                 RETURN(PTR_ERR(osd_seq));
1133
1134         dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1135         d = osd_seq->oos_dirs[dirn];
1136         LASSERT(d);
1137
1138         osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1139         rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
1140
1141         RETURN(rc);
1142 }
1143
1144 int osd_obj_map_recover(struct osd_thread_info *info,
1145                         struct osd_device *osd,
1146                         struct inode *src_parent,
1147                         struct dentry *src_child,
1148                         const struct lu_fid *fid)
1149 {
1150         struct osd_obj_seq         *osd_seq;
1151         struct dentry              *tgt_parent;
1152         struct dentry              *tgt_child = &info->oti_child_dentry;
1153         struct inode               *dir;
1154         struct inode               *inode     = src_child->d_inode;
1155         struct ost_id              *ostid     = &info->oti_ostid;
1156         handle_t                   *jh;
1157         struct ldiskfs_dir_entry_2 *de;
1158         struct buffer_head         *bh;
1159         char                        name[32];
1160         int                         dirn;
1161         int                         rc        = 0;
1162         ENTRY;
1163
1164         if (fid_is_last_id(fid)) {
1165                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1166                 if (IS_ERR(osd_seq))
1167                         RETURN(PTR_ERR(osd_seq));
1168
1169                 tgt_parent = osd_seq->oos_root;
1170                 tgt_child->d_name.name = "LAST_ID";
1171                 tgt_child->d_name.len = strlen("LAST_ID");
1172         } else {
1173                 fid_to_ostid(fid, ostid);
1174                 osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
1175                 if (IS_ERR(osd_seq))
1176                         RETURN(PTR_ERR(osd_seq));
1177
1178                 dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
1179                 tgt_parent = osd_seq->oos_dirs[dirn];
1180                 osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
1181                 tgt_child->d_name.name = name;
1182                 tgt_child->d_name.len = strlen(name);
1183         }
1184         LASSERT(tgt_parent != NULL);
1185
1186         dir = tgt_parent->d_inode;
1187         tgt_child->d_name.hash = 0;
1188         tgt_child->d_parent = tgt_parent;
1189         tgt_child->d_inode = inode;
1190
1191         /* The non-initialized src_child may be destroyed. */
1192         jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
1193                                 osd_dto_credits_noquota[DTO_INDEX_DELETE] +
1194                                 osd_dto_credits_noquota[DTO_INDEX_INSERT] +
1195                                 osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
1196         if (IS_ERR(jh))
1197                 RETURN(PTR_ERR(jh));
1198
1199         ll_vfs_dq_init(src_parent);
1200         ll_vfs_dq_init(dir);
1201
1202         inode_lock(src_parent);
1203         inode_lock(dir);
1204         bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
1205         if (!IS_ERR(bh)) {
1206                 /* XXX: If some other object occupied the same slot. And If such
1207                  *      inode is zero-sized and with SUID+SGID, then means it is
1208                  *      a new created one. Maybe we can remove it and insert the
1209                  *      original one back to the /O/<seq>/d<x>. But there are
1210                  *      something to be considered:
1211                  *
1212                  *      1) The OST-object under /lost+found has crashed LMA.
1213                  *         So it should not conflict with the current one.
1214                  *
1215                  *      2) There are race conditions that: someone may just want
1216                  *         to modify the current one. Even if the OI scrub takes
1217                  *         the object lock when remove the current one, it still
1218                  *         cause the modification to be lost becasue the target
1219                  *         has been removed when the RPC service thread waiting
1220                  *         for the lock.
1221                  *
1222                  *      So keep it there before we have suitable solution. */
1223                 brelse(bh);
1224                 inode_unlock(dir);
1225                 inode_unlock(src_parent);
1226                 ldiskfs_journal_stop(jh);
1227
1228                 rc = -EEXIST;
1229                 /* If the src object has never been modified, then remove it. */
1230                 if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
1231                     inode->i_mode & S_ISGID) {
1232                         rc = ll_vfs_unlink(src_parent, src_child);
1233                         if (unlikely(rc == -ENOENT))
1234                                 rc = 0;
1235                 }
1236                 RETURN(rc);
1237         }
1238
1239         bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
1240                                     NULL, NULL);
1241         if (unlikely(IS_ERR(bh)))
1242                 GOTO(unlock, rc = PTR_ERR(bh));
1243
1244         rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
1245         brelse(bh);
1246         if (rc != 0)
1247                 GOTO(unlock, rc);
1248
1249         rc = osd_ldiskfs_add_entry(info, osd, jh, tgt_child, inode, NULL);
1250
1251         GOTO(unlock, rc);
1252
1253 unlock:
1254         inode_unlock(dir);
1255         inode_unlock(src_parent);
1256         ldiskfs_journal_stop(jh);
1257         return rc;
1258 }
1259
1260 static struct dentry *
1261 osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
1262                      const struct lu_fid *fid, char **name)
1263 {
1264         struct dentry *root = ERR_PTR(-ENOENT);
1265
1266         if (fid_is_last_id(fid)) {
1267                 struct osd_obj_seq *osd_seq;
1268
1269                 /* on creation of LAST_ID we create O/<seq> hierarchy */
1270                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1271                 if (IS_ERR(osd_seq))
1272                         RETURN((struct dentry *)osd_seq);
1273
1274                 *name = "LAST_ID";
1275                 root = osd_seq->oos_root;
1276         } else {
1277                 *name = osd_lf_fid2name(fid);
1278                 if (*name == NULL)
1279                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
1280                 else if ((*name)[0])
1281                         root = osd_sb(osd)->s_root;
1282         }
1283
1284         return root;
1285 }
1286
1287 int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
1288                         const struct lu_fid *fid, const struct osd_inode_id *id,
1289                         handle_t *th)
1290 {
1291         struct dentry   *root;
1292         char            *name = NULL;
1293         int              rc;
1294         ENTRY;
1295
1296         root = osd_object_spec_find(info, osd, fid, &name);
1297         if (!IS_ERR(root)) {
1298                 rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
1299         } else {
1300                 rc = PTR_ERR(root);
1301                 if (rc == -ENOENT)
1302                         rc = 1;
1303         }
1304
1305         RETURN(rc);
1306 }
1307
1308 int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
1309                         const struct lu_fid *fid, const struct osd_inode_id *id,
1310                         handle_t *th)
1311 {
1312         struct dentry   *root;
1313         char            *name = NULL;
1314         int              rc;
1315         ENTRY;
1316
1317         root = osd_object_spec_find(info, osd, fid, &name);
1318         if (!IS_ERR(root)) {
1319                 rc = osd_obj_add_entry(info, osd, root, name, id, th);
1320         } else {
1321                 rc = PTR_ERR(root);
1322                 if (rc == -ENOENT)
1323                         rc = 0;
1324         }
1325
1326         RETURN(rc);
1327 }
1328
1329 int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
1330                         const struct lu_fid *fid, struct osd_inode_id *id)
1331 {
1332         struct dentry   *root;
1333         struct dentry   *dentry;
1334         struct inode    *inode;
1335         char            *name = NULL;
1336         int             rc = -ENOENT;
1337         ENTRY;
1338
1339         if (fid_is_last_id(fid)) {
1340                 struct osd_obj_seq *osd_seq;
1341
1342                 osd_seq = osd_seq_load(info, osd, fid_seq(fid));
1343                 if (IS_ERR(osd_seq))
1344                         RETURN(PTR_ERR(osd_seq));
1345                 root = osd_seq->oos_root;
1346                 name = "LAST_ID";
1347         } else {
1348                 root = osd_sb(osd)->s_root;
1349                 name = osd_lf_fid2name(fid);
1350                 if (name == NULL || strlen(name) == 0)
1351                         RETURN(-ENOENT);
1352         }
1353
1354         dentry = ll_lookup_one_len(name, root, strlen(name));
1355         if (!IS_ERR(dentry)) {
1356                 inode = dentry->d_inode;
1357                 if (inode) {
1358                         if (is_bad_inode(inode)) {
1359                                 rc = -EIO;
1360                         } else {
1361                                 osd_id_gen(id, inode->i_ino,
1362                                            inode->i_generation);
1363                                 rc = 0;
1364                         }
1365                 }
1366                 /* if dentry is accessible after osd_compat_spec_insert it
1367                  * will still contain NULL inode, so don't keep it in cache */
1368                 d_invalidate(dentry);
1369                 dput(dentry);
1370         }
1371
1372         RETURN(rc);
1373 }